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VHDL-based synthesis in XST

This resource provides insights into VHDL-based synthesis in XST, covering VHDL language support, synthesis subsets, and circuit descriptions. Learn about combinatorial circuits, conditional signal assignments, and generate statements in VHDL. Explore examples and best practices for efficient FPGA programming. Ideal for learners and practitioners in digital design and FPGA development.

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VHDL-based synthesis in XST

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  1. VHDL-based synthesis in XST Peter Marwedel Informatik XII, U. Dortmund

  2. Xilinx Synthesis Technology (XST) • Einführung • SystemC • Vorlesungen und Programmierung • FPGAs • Vorlesungen • VHDL-basierte Konfiguration von FPGAs mit dem XUP VII Pro Entwicklungssystem • Algorithmen • Mikroarchitektur-Synthese • Automatensynthese • Logiksynthese • Layoutsynthese • Heute: VHDL-basierte Synthese in XSTQuelle: //toolbox.xilinx.com/docsan/xilinx9/books/docs/xst/xst.pdfChapter 6 • Buch: J. Reichardt/B.Schwarz: VHDL-Synthese, Oldenbourg, 2000

  3. VHDL-based synthesis in XST • Ideally, all VHDL language elements would be supported in XST. • In practice, this is hardly feasible, since VHDL was designed for simulation, not for synthesis(same situation as for SystemC).   Synthesis subset of VHDL! • (VHDL-based) Synthesis: VHDL-model  netlistwhere netlist=(components, nets) andcomponents={gates, flip-flops, Xilinx-library elements}

  4. VHDL IEEE support XST supports: • VHDL IEEE std 1076-1987 • VHDL IEEE std 1076-1993 • VHDL IEEE std 1076-2006 (partially implemented) * VHDL IEEE Conflicts • VHDL IEEE std 1076-1987 constructs are accepted if they do not conflict with VHDL IEEE std 1076-1993. In case of a conflict, VHDL IEEE Std 1076-1993 behavior overrides VHDL IEEE std 1076-1987. • In cases where: VHDL IEEE std 1076-1993 requires a construct to be an erroneous case, but VHDL IEEE std 1076-1987 accepts it, XST issues a warning instead of an error.

  5. 1. Combinatorial circuits • Combinatorial circuits can be described using • Simple signal assignmentsExample:t <= a and b; -- after clause ignored -- (not precisely synthesizable)! • Selected signal assignments • Conditional signal assignments • Generate statements • Combinatorial processes

  6. Selected signal assignment • Example (multiplexer description):library IEEE; • use IEEE.std_logic_1164.all; • entity select_bhv is • generic (width: integer := 8); • port (a, b, c, d: in std_logic_vector (width-1 downto 0); • selector: in std_logic_vector (1 downto 0); • T: out std_logic_vector (width-1 downto 0) ); • end select_bhv; • architecture bhv of select_bhv is • begin • with selector select • T <= a when "00", • b when "01", • c when "10", • d when others; -- all cases to be covered (otherwise sequential) • end bhv;

  7. Conditional signal assignment • Example (multiplexer description):library IEEE; • use IEEE.std_logic_1164.all; • entity select_bhv is • generic (width: integer := 8); • port (a, b, c, d: in std_logic_vector (width-1 downto 0); • selector: in std_logic_vector (1 downto 0); • T: out std_logic_vector (width-1 downto 0) ); • end select_bhv; • architecture bhv of select_bhv is • begin • with selector select • T <= a when selector="00“ else • b when selector="01“ else • c when selector="10“ else • d; -- all cases to be covered (otherwise sequential) • end bhv;

  8. Generate statement • Example: • entity EXAMPLE is • port ( A,B : in BIT_VECTOR (0 to 7); CIN : in BIT; • SUM : out BIT_VECTOR (0 to 7); COUT : out BIT); • end EXAMPLE; • architecture ARCHI of EXAMPLE is • signal C : BIT_VECTOR (0 to 8); • begin • C(0) <= CIN; • COUT <= C(8); • LOOP_ADD : for I in 0 to 7 generate • SUM(I) <= A(I) xor B(I) xor C(I); • C(I+1) <= (A(I) and B(I)) or (A(I) and C(I)) or (B(I) and C(I)); • end generate; • end ARCHI; • -- VHDL code generates 8-bit adder

  9. If <condition> generate • entity EXAMPLE is • generic (N:INTEGER := 8); • port ( A,B : in BIT_VECTOR (0 to 7); CIN : in BIT; • SUM : out BIT_VECTOR (0 to 7); COUT : out BIT); • end EXAMPLE; • architecture ARCHI of EXAMPLE is • signal C : BIT_VECTOR (0 to 8); • begin • L1: if (N>=4 and <=32) generate • C(0) <= CIN; • COUT <= C(8); • LOOP_ADD : for I in 0 to N generate • SUM(I) <= A(I) xor B(I) xor C(I); • C(I+1) <= (A(I) and B(I)) or (A(I) and C(I)) or (B(I) and C(I)); • end generate; • end generate; • end ARCHI;

  10. Combinatorial Process • Treatment of signal assignments within process different from concurrent signal assignments: The value assignments are made in a sequential mode. • Assignments may cancel previous ones. Example: • entity EXAMPLE is port ( A, B : in BIT; S : out BIT); • end EXAMPLE; • architecture ARCHI of EXAMPLE is • begin • process ( A, B ) • begin • S <= ’0’ ; S<=(A and B); • S <= ’1’ ; • end process; • end ARCHI; • First the signal S is assigned to 0, but later, the value S is changed to 1.

  11. Combinatorial Process • A process is called combinatorial when its inferred HW does not involve any memory elements( assigned signals  process,  paths: explicit assignment). • A combinatorial process has a sensitivity list. • For a combinatorial process, this sensitivity list mustcontain all signals which appear in conditions (if, case, etc.), and any signal appearing on the right hand side of an assignment. If one or more signals are missing from the sensitivity list, XST generates a warning for the missing signals, and adds them to the sensitivity list.In this case, the result of the synthesis may be different from the initial design specification (!!!). !! !!

  12. Local variables • A process may contain local variables. Due to the absence of delays, variables are handled like signals.Example: • library ASYL; use ASYL.ARITH.all; • entity ADDSUB is • port ( A,B : in BIT_VECTOR (3 downto 0); ADD_SUB : in BIT; • S : out BIT_VECTOR (3 downto 0)); • end ADDSUB; • architecture ARCHI of ADDSUB is • begin • process ( A, B, ADD_SUB ) • variable AUX : BIT_VECTOR (3 downto 0); • begin • if ADD_SUB = ’1’ then AUX := A + B ; else AUX := A - B ; end if; • S <= AUX; • end process; • end ARCHI;

  13. if … else statements in combinational processes • library IEEE; use IEEE.std_logic_1164.all; • entity mux4 is • port (a, b, c, d: in std_logic_vector (7 downto 0); sel1, sel2: in std_logic; outmux: out std_logic_vector (7 downto 0)); • end mux4; • architecture behavior of mux4 is • begin • process (a, b, c, d, sel1, sel2) • begin • if (sel1 = ’1’) then • if (sel2 = ’1’ ) then outmux <= a; • else outmux <= b; • end if; • else • if (sel2 = ’1’ ) then outmux <= c; • else outmux <= d; • end if; end if; end process; end behavior; There must be assignments to outmux for all execution paths; otherwise the process would not be combinatorial

  14. Case statementsin combinational processes • Important to avoid sequential behavior. • Example:library IEEE; use IEEE.std_logic_1164.all; • entity mux4 is port (a, b, c, d: in std_logic_vector (7 downto 0); • sel: in std_logic_vector (1 downto 0); • outmux: out std_logic_vector (7 downto 0)); • end mux4; • architecture behavior of mux4 is • begin • process (a, b, c, d, sel) • begin • case sel is • when "00" => outmux <= a; • when "01" => outmux <= b; • when "10" => outmux <= c; • when others => outmux <= d;-- case statement must be complete • end case; end process; end behavior;

  15. For .. Loop statementsin combinational processes • The for… loop statement is supported for : • Constant bounds • Stop test condition using operators <, <=, > or >= • Next step computation in one of the specifications: • var = var + step • var = var – step (where var: loop variable, step:a constant value). • next and exit statements are supported.

  16. for .. loop statements: Example • library IEEE; use IEEE.std_logic_1164.all; • use IEEE.std_logic_unsigned.all; • entity countzeros is • port (a: in std_logic_vector (7 downto 0); • Count: out std_logic_vector (2 downto 0)); • end countzeros; • architecture behavior of countzeros is • signal Count_Aux: std_logic_vector (2 downto 0); • begin process (a) • begin • Count_Aux <= "000"; • for i in a’range loop • if (a[i] = ’0’) then • Count_Aux <= Count_Aux + 1; -- + defined in std_logic_unsigned • end if; • end loop; • Count <= Count_Aux; • end process; end behavior;

  17. Sequential circuits • A process is sequential when it is not a combinatorial process( signal assigned somewhere, path:   assignment to this signal on this path) •  Generated HW has an internal state or memory. • Sequential circuits can be described using sequential processes. • 2 types of descriptions are allowed by XST: • sequential processes with a sensitivity list • sequential processes without a sensitivity list

  18. Sequential processes with a sensitivity list • Template with asynchronous & synchronous parts • process ( CLK, RST ) ... • begin • if RST = <’0’ | ’1’> then • -- an asynchronous part may appear here -- optional part • elsif <CLK'EVENT | not CLK’STABLE> and CLK = <'0' | '1'> then • -- synchronous part sequential statements may appear here • end if; end process; • Note: Asynchronous signals must be declared in the sensitivity list. Otherwise, XST generates a warning and adds them to the sensitivity list. In this case, the behavior of the synthesis result may be different from the initial specification.

  19. Sequential processes without a sensitivity list- single wait statement - • Inference of registers:Sequential processes w/o a sensitivity and exactly 1 "wait" statement. It must be the first statement. • The condition must be a condition on the clock signal. • An asynchronous part can not be specified. • Example:process ... • begin • wait until <CLK'EVENT | not CLK’ STABLE> and CLK = <'0' | '1'>; • ... -- a synchronous part may be specified here. • end process;

  20. Description of registers • entity EXAMPLE is port ( DI : in BIT_VECTOR (7 downto 0); CLK : in BIT; DO : out BIT_VECTOR (7 downto 0) ); • end EXAMPLE; • architecture ARCHI of EXAMPLE is • begin process begin • wait until CLK’EVENT and CLK = ’1’; • DO <= DI ; • end process; end ARCHI; No sensivity list • entity EXAMPLE is port ( DI : in BIT_VECTOR (7 downto 0); CLK : in BIT; DO : out BIT_VECTOR (7 downto 0) ); • end EXAMPLE; • architecture ARCHI of EXAMPLE is • begin process ( CLK ) • begin • if CLK'EVENT and CLK = '1' then DO <= DI ; end if; • end process; end ARCHI; With sensivity list

  21. Description of counters • library ASYL; use ASYL.PKG_ARITH.all; • entity EXAMPLE is • port ( CLK : in BIT; RST : in BIT; • DO : out BIT_VECTOR (7 downto 0) ); • end EXAMPLE; • architecture ARCHI of EXAMPLE is • begin • process ( CLK, RST ) • variable COUNT : BIT_VECTOR (7 downto 0); • begin • if RST = ’1’ then COUNT := "00000000"; • elsif CLK’EVENT and CLK = ’1’ then • COUNT := COUNT + "00000001"; • end if; • DO <= COUNT; • end process; end ARCHI;

  22. Sequential processes without a sensitivity list- multiple wait statements - • Sequential circuits can be described with multiple wait statements in a process.When using XST, several rules must be respected: • The process must only contain one loop statement. • The first statement in the loop must be a wait statement. • After each wait statement, a next or exit statement must be defined. • The condition in the wait statements must be the same for each wait statement. • This condition must use only one signal—the clock signal. • This condition must have the following form:wait [on <clock_signal>] until [(<clock_signal>’EVENT |not <clock_signal>’STABLE) and ] <clock_signal> = <’0’ | ’1’>;"

  23. Example • library IEEE; use IEEE.STD_LOGIC_1164.all; • entity EXAMPLE is port (CLK : in STD_LOGIC; RST : in STD_LOGIC • (DATA1,DATA2,DATA3,DATA4:in STD_LOGIC_VECTOR • (3 downto 0);RESULT:out STD_LOGIC_VECTOR(3 downto 0); ); • end EXAMPLE; • architecture ARCH of EXAMPLE is • begin process begin • SEQ_LOOP : loop • wait until CLK’EVENT and CLK = ’1’; • exit SEQ_LOOP when RST = ’1’; • RESULT <= DATA1; • wait until CLK’EVENT and CLK = ’1’; • exit SEQ_LOOP when RST = ’1’; • RESULT <= DATA2; • wait until CLK’EVENT and CLK = ’1’; • exit SEQ_LOOP when RST = ’1’; • RESULT <= DATA3; • wait until CLK’EVENT and CLK = ’1’; • exit SEQ_LOOP when RST = ’1’; • RESULT <= DATA4; • end loop; end process; end ARCH; obviously considered sequential even though values assigned to output in all cases

  24. Functions and procedures • The declaration of a function or a procedure provides a mechanism for handling blocks used multiple times in a design. • Functions and procedures can be declared in the declarative part of an entity, in an architecture, or in packages. • Parameters can be unconstrained. The content is similar to the combinatorial process content. • Resolution functions are not supported except the one defined in the IEEE std_logic_1164 package. • Recursive function/procedure calls are not supported.

  25. Example • package pkg isfunction add (a,b, c in : bit ) return bit_vector; • end pkg; • packagebody pkg is • function add (a,b, c in : bit ) return bit_vector is • variable s, cout : bit; variable result : bit_vector (1 downto 0); • begin s := a xor b xor cin; • cout := (a and b) or (a and cin) or (b and cin); • result := cout & s; return result; • end add; end pkg; • use work.pkg.all; entity example is • port ( a,b : in bit_vector (3 downto 0); cin : in bit; • s : out bit_vector (3 downto 0); cout: out bit ); • end example; • architecture archi of example is • signal s0, s1, s2, s3 : bit_vector (1 downto 0); • begin • s0 <= add ( a(0), b(0), cin ); s1 <= add ( a(1), b(1), s0(1) ); • s2 <= add ( a(2), b(2), s1(1) ); s3 <= add ( a(3), b(3), s2(1) ); • s <= s3(0) & s2(0) & s1(0) & s0(0); cout <= s3(1);end archi; The "ADD" function is a single bit adder. This function is called 4 times with the proper parameters to create a 4-bit adder.

  26. State Machines • XST proposes a large set of templates to describe Finite State Machines (FSMs). By default, XST tries to recognize FSMs from VHDL/Verilog code, and apply several state encoding techniques (it can re-encode the user’s initial encoding) to get better performance or less area. • However, FSM extraction can be disabled using an FSM_extract design constraint. • XST can handle only synchronous state machines. Example: x1='1‘ x1='0‘

  27. FSM with 1 Process • library IEEE; use IEEE.std_logic_1164.all; • entity fsm is • port (clk,reset,x1:IN std_logic; outp:OUT std_logic); • end entity; • architecture beh1 of fsm is • type state_type is (s1,s2,s3,s4); • signal state: state_type ; • begin • process (clk,reset) • begin • if (reset =’1’) then state <=s1; outp<=’1’; • elsif (clk=’1’ and clk’event) then • case state is • when s1 => if x1=’1’ then state <= s2; else state <= s3; end if; • outp <= ’1’; • when s2 => state <= s4; outp <= ’1’; • when s3 => state <= s4; outp <= ’0’; • when s4 => state <= s1; outp <= ’0’; • end case; • end if; • end process; end beh1; x1='1‘ x1='0‘ Please note, in this example output signal "outp" is a register.

  28. FSM with 2 Processes • library IEEE; use IEEE.std_logic_1164.all; • entity fsm is port (clk, reset, x1 : IN std_logic; outp : OUT std_logic); • end entity; • architecture beh1 of fsm is • type state_type is (s1,s2,s3,s4); • signal state: state_type ; • begin process1: process (clk,reset) • begin • if (reset =’1’) then state <=s1; • elsif (clk=’1’ and clk’Event) then • case state is • when s1 => if x1=’1’ then state <= s2;else state <= s3; end if; • when s2 => state <= s4; • when s3 => state <= s4; • when s4 => state <= s1; • end case; end if; end process process1; process2 : process (state) begin case state is when s1 => outp <= ’1’; when s2 => outp <= ’1’; when s3 => outp <= ’0’; when s4 => outp <= ’0’; end case; end process process2; end beh1;

  29. FSM with 3 Processes process2 : process (state, x1) begin case state is when s1 => if x1=’1’ then next_state <= s2; else next_state <= s3; end if; when s2 => next_state <= s4; when s3 => next_state <= s4; when s4 => next_state <= s1; end case; end process process2; • library IEEE; • use IEEE.std_logic_1164.all; • entity fsm is • port ( clk, reset, x1 : IN std_logic; • outp : OUT std_logic); • end entity; • architecture beh1 of fsm is • type state_type is (s1,s2,s3,s4); • signal state, next_state: state_type ; • begin • process1: process (clk,reset) • begin • if (reset =’1’) then • state <=s1; • elsif (clk=’1’ and clk’Event) then • state <= next_state; • end if; • end process process1; process3 : process (state) begin case state is when s1 => outp <= ’1’; when s2 => outp <= ’1’; when s3 => outp <= ’0’; when s4 => outp <= ’0’; end case; end process; end beh1;

  30. Coding styles for FSMs • State Registers • State Registers must to be initialized with an asynchronous or synchronous signal. XST does not support FSMs without initialization signals. • In VHDL the type of state registers can be of different types: integer, bit_vector, std_logic_vector, for example.It is common and convenient to define an enumerated type containing all possible state values and to declare a state register with that type.

  31. Coding styles for FSMs • Next State Equations • Can be described directly in the sequential process or in a distinct combinational process. • The simplest template is based on a Case statement. • If using a separate combinational process, its sensitivity list should contain the state signal and all FSM inputs. • FSM Outputs • Non-registered outputs are described either in the combinational process or concurrent assignments. • Registered outputs must be assigned within the sequential process.

  32. Packages • XST provides full support for packages. To use a given package, the following lines must be included at the beginning of the VHDL design: • librarylib_pack; • -- lib_pack is the name of the library specified where the • -- package has been compiled (work by default) • uselib_pack.pack_name.all; • -- pack_name is the name of the defined package. • XST also supports predefined packages; these packages are pre-compiled and can be included in VHDL designs. These packages are intended for use during synthesis, but may also used for simulation.

  33. Supported packages • STANDARD Package: • contains basic types (bit, bit_vector, and integer). • Included by default. • IEEE Packages supported. • std_logic_1164: defines types std_logic, std_ulogic, std_logic_vector, std_ulogic_vector, and conversion functions based on these types. • numeric_bit: supports types unsigned, signed vectors based on type bit, and all overloaded arithmetic operators on these types, conversion and extended functions for these types. • numeric_std: supports types unsigned, signed vectors based on type std_logic. Equivalent to std_logic_arith. • math_real: real number constants e, 1/e, , 2 , 1/, … and functions sin(x), cos(x), …

  34. Supported packages • Synopsys Packages supported in the IEEE library: • std_logic_arith: supports types unsigned, signed vectors, and all overloaded arithmetic operators on these types. It also defines conversion and extended functions for these types. • std_logic_unsigned: defines arithmetic operators on std_ulogic_vector and considers them as unsigned operators. • std_logic_signed: defines arithmetic operators on std_logic_vector and considers them as signed operators. • std_logic_misc: defines supplemental types, subtypes, constants, and functions for the std_logic_1164 package (and_reduce, or_reduce, ...)

  35. Objects in VHDL • Signals: can be declared in architecture declarative part & used anywhere within the architecture.Can also be declared and used within a block. • Variables: declared in a process, subprogram, or architecture (shared variable, VHDL’93); Shared variables allowed only to denote RAM • Constants: can be declared and used within any region. Their value cannot be changed. • Files, Alias, Components: supported • Attributes: some support

  36. Basic types accepted by XST • Enumerated Types: • BIT ('0','1'); BOOLEAN (false, true) • STD_LOGIC ('U','X','0','1','Z','W','L','H','-').For XST synthesis, the ’0’ and ’L’ values are treated identically, as are ’1’ and ’H’. The ’X’, and ’-’ values are treated as don’t care. The ’U’ and ’W’ values are not accepted by XST. The ’Z’ value is treated as high impedance. • User defined enumerated type:type COLOR is (RED,GREEN,YELLOW); • Bit Vector Types: • BIT_VECTOR, STD_LOGIC_VECTOR • Unconstrained types are not accepted • Integer Type: INTEGER • Predefined types: BIT, BOOLEAN, BIT_VECTOR, INTEGER, REAL • The following types are declared in the STD_LOGIC_1164 IEEE Package: STD_LOGIC, STD_LOGIC_VECTOR

  37. Multi-dimensional Array Types • XST: multi-dimensional array types  3 dimensions. • Arrays can be signals, constants, or VHDL variables. • Assignments & arithmetic operations with arrays allowed. • Multidimensional arrays can be passed to functions, & used in instantiations. • Arrays must be fully constrained in all dimensions. • Example: • subtype WORD8 is STD_LOGIC_VECTOR (7 downto 0); • type TAB12 is array (11 downto 0) of WORD8; • type TAB03 is array (2 downto 0) of TAB12;

  38. Example • subtype WORD8 is STD_LOGIC_VECTOR (7 downto 0); • type TAB12 is array (4 downto 0) of WORD8; • type TAB03 is array (2 downto 0) of TAB12; • signal WORD_A : WORD8; • signal TAB_A, TAB_B : TAB05; • signal TAB_C, TAB_D : TAB03; • constant CST_A : TAB03 := ( • (“0000000”,“0000001”,”0000010”,”0000011”,”0000100”) • (“0010000”,“0010001”,”0010010”,”0100011”,”0010100”) • (“0100000”,“0100001”,”0100010”,”0100011”,”0100100”)); • A multi-dimensional array signal or variable can be completely used: • TAB_A <= TAB_B; TAB_C <= TAB_D; TAB_C <= CNST_A; • Just an index of one array can be specified: • TAB_A (5) <= WORD_A; TAB_C (1) <= TAB_A; • Just indexes of the maximum number of dimensions can be specified: • TAB_A (5) (0) <= '1'; TAB_C (2) (5) (0) <= '0'

  39. Example • subtype WORD8 is STD_LOGIC_VECTOR (7 downto 0); • type TAB12 is array (4 downto 0) of WORD8; • type TAB03 is array (2 downto 0) of TAB12; • signal WORD_A : WORD8; • signal TAB_A, TAB_B : TAB05; • signal TAB_C, TAB_D : TAB03; • constant CST_A : TAB03 := ( • (“0000000”,“0000001”,”0000010”,”0000011”,”0000100”) • (“0010000”,“0010001”,”0010010”,”0100011”,”0010100”) • (“0100000”,“0100001”,”0100010”,”0100011”,”0100100”); • Just a slice of the first array can be specified: • TAB_A (4 downto 1) <= TAB_B (3 downto 0); • Just an index of a higher level array and a slice of a lower level array • can be specified: • TAB_C (2) (5) (3 downto 0) <= TAB_B (3) (4 downto 1); • TAB_D (0) (4) (2 downto 0) <= CNST_A (5 downto 3) • Indices may be variable.

  40. Record Types • XST supports record types. • Example: • type REC1 is record • field1: std_logic; • field2: std_logic_vector (3 downto 0) • end REC1; • Properties: • Record types can contain other record types. • Constants cannot be record types. • Record types cannot contain attributes. • XST does not support aggregate assignments to record signals.

  41. Entity Declaration • The I/O ports of the circuit are declared in the entity. • Each port has a name, a mode (in, out, inout or buffer) and a type. • Types of ports must be constrained, and not more than one dimensional array types are accepted as ports.

  42. Component Configuration • XST supports component configurations in the declarative part of the architecture: • forinstantiation_list: component_name use • LibName.entity_Name(Architecture_Name); • Example: • for all : NAND2 use entity work.NAND2(ARCHI); • All NAND2 components will use the entity NAND2 and architecture ARCHI. • No configuration:  XST links the component to the entity with the same name (& same interface) & the selected architecture to the most recently compiled architecture. • If no entity/architecture is found, a black box is generated during the synthesis.

  43. VHDL Language support supported supported

  44. Packages Type TIME unsupported supported Math_real supported

  45. Supported types supported supported Time ignored, real supported for constant calculations

  46. Modes and declarations

  47. Objects supported supported

  48. Specifications and names supported

  49. Operators supported

  50. Wait and loop state-ments supported, for static conditions supported supported

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